US4175923A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and apparatus for occult blood testing in the home
Assignee: SmithKline Diagnostics Inc
•
Filing: 1978-06-26
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Granted: 1979-11-27
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Expires: 1998-06-26
Abstract
Abstract A method for determining the presence of occult blood in the bowl of a toilet containing water and fecal matter includes the steps of applying a developing solution to a sheet of absorbent paper impregnated with a guaiac reagent to form an activated test sheet of paper, and contacting the test paper with the water in the toilet bowl. Preferably, the test sheet is an absorbent paper impregnated with a guaiac reagent and having only a portion thereof additionally impregnated with blood in an amount sufficient to react with the guaiac in the presence of a developing solution to dye the paper blue. The blood impregnated portion of the sheet upon use forms a dyed test strip with which the person using the paper can make a comparison to determine whether and the extent to which the actual guaiac reaction has taken place on the remaining portion of the sheet.
Inventors
- 👤 William G. Friend
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 19:47
CPC Classifications
G; G01; G01N; G01N33/00; G01N33/48; G01N33/50; G01N33/72; G01N33/721; G01N33/726; C; C12; C12Q; C12Q1/00; C12Q1/26; C12Q1/28; C12Q2326/00; Y; Y10; Y10S; Y10S436/00; Y10S436/904; Y10T; Y10T436/00; Y10T436/25
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
67 words
A method for determining the presence of occult blood in the bowl of a toilet containing water and fecal matter comprising the steps of: applying a developing solution to an absorbent substrate impregnated with a guaiac reagent to form an activated test substrate, contacting the activated test substrate with the water in said toilet bowl, and observing whether a portion of the test substrate is dyed blue.
Claim 2
Independent Claim
67 words
A method for determining the presence of occult blood in the bowl of a toilet containing water and fecal matter comprising the steps of: applying a developing solution to an absorbent substrate impregnated with a guaiac reagent to form an activated test substrate, contacting the activated test substrate with the water in said toilet bowl, and observing whether a portion of the test substrate is dyed blue.
Claim 3
Dependent Claim
22 words
The method of claim 1 wherein said test substrate is placed on the surface of said water and allowed to float thereon.
Claim 4
Dependent Claim
46 words
The method of claim 1 further comprising the step of prior to applying said developing solution to said absorbent substrate, impregnating a predetermined portion of said substrate with blood that will react with guaiac in the presence of a developing solution to dye said substrate blue.
Claim 5
Dependent Claim
24 words
The method of claim 1 further comprising the step of agitating the water in said bowl prior to placing said substrate in said water.
Claim 6
Dependent Claim
23 words
The method of claim 1 further comprising the step of agitating the water in said bowl after placing said substrate in said water.
Claim 7
Dependent Claim
35 words
The method of claim 4 or 5 wherein said water is agitated by placing a composition of matter in said bowl which, upon contact with water, will chemically react to effervesce and agitate said water.
Claim 8
Dependent Claim
14 words
The method of claim 1 wherein said substrate comprises a sheet of absorbent paper.
Claim 9
Dependent Claim
112 words
A home test kit for determining the presence of occult blood in the bowl of a toilet containing water and fecal matter comprising: an absorbent substrate impregnated with a guaiac reagent, said absorbent substrate having only a portion thereof additionally impregnated with a composition that is present in said only portion of said absorbent substrate in an amount sufficient to react with said guaiac reagent in the presence of a developing solution to dye at least a portion of said substrate blue, and a receptacle containing a developing solution that, when applied to said substrate and thereafter contacted with blood, will cause said guaiac reagent to react and dye said substrate blue.
Claim 10
Dependent Claim
112 words
A home test kit for determining the presence of occult blood in the bowl of a toilet containing water and fecal matter comprising: an absorbent substrate impregnated with a guaiac reagent, said absorbent substrate having only a portion thereof additionally impregnated with a composition that is present in said only portion of said absorbent substrate in an amount sufficient to react with said guaiac reagent in the presence of a developing solution to dye at least a portion of said substrate blue, and a receptacle containing a developing solution that, when applied to said substrate and thereafter contacted with blood, will cause said guaiac reagent to react and dye said substrate blue.
Claim 11
Dependent Claim
10 words
The kit of claim 8 wherein said composition comprises blood.
Claim 12
Dependent Claim
13 words
The kit of claim 8 wherein said developing solution comprises a peroxide solution.
Claim 13
Dependent Claim
26 words
The kit of claim 8 further comprising: a composition that, upon contact with water, will effervesce to agitate the water in a bowl containing fecal matter.
Claim 14
Dependent Claim
14 words
The kit of claim 8 wherein said substrate comprises a sheet of absorbent paper.
Claim 15
Dependent Claim
70 words
A test substrate for use in determining the presence of occult blood comprising: an absorbent substrate impregnated with a guaiac reagent, said substrate having only a portion thereof additionally impregnated with a composition that is present in said only portion of said substrate in an amount sufficient to react with said guaiac reagent in the presence of a developing solution to dye at least a portion of said substrate blue.
Claim 16
Dependent Claim
70 words
A test substrate for use in determining the presence of occult blood comprising: an absorbent substrate impregnated with a guaiac reagent, said substrate having only a portion thereof additionally impregnated with a composition that is present in said only portion of said substrate in an amount sufficient to react with said guaiac reagent in the presence of a developing solution to dye at least a portion of said substrate blue.
Claim 17
Dependent Claim
11 words
The test substrate of claim 13 wherein said composition comprises blood.
Claim 18
Dependent Claim
16 words
The test substrate of claim 13 wherein said absorbent substrate comprises a sheet of absorbent paper.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1982-11-26 | 1983-05-28 | 1983-11-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-11-26 | 1987-05-28 | 1987-11-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-11-26 | 1991-05-28 | 1991-11-27 | $7700.00 | Window Closed / Lapsed |